Detail publikace

Determination of convective and radiative heat transfer coefficients using 34-zones thermal manikin: Uncertainty and reproducibility evaluation

FOJTLÍN, M. FIŠER, J. JÍCHA, M.

Originální název

Determination of convective and radiative heat transfer coefficients using 34-zones thermal manikin: Uncertainty and reproducibility evaluation

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

A lot of research has been done in order to investigate heat transfer coefficients of human body in various postures, wind speeds and wind directions (e.g., [1-15]). However, there has not been any reference to measurement reproducibility and measurement confidence intervals. The purpose of this study was to determine heat transfer coefficients of a thermal manikin experimentally, while focusing on the repeated determination of the coefficients and statistic data evaluation. The manikin imitates human metabolic heat production; it measures a combined dry heat flux from its surface and also its surface temperature. The major part of the radiative heat flux was eliminated by low-emissivity coating applied to the surface of the nude manikin. The tests were performed across 34 zones that correspond to parts of a human body. Both standing and seated postures were investigated. The tests were conducted at constant air temperature (24°C) and constant wind speed (0.05 m.s-1) environment. Based on three repetitions of each case, the average values of heat transfer coefficients with their confidence intervals were calculated. Next, the results of this paper were compared to the results of similar experimental work of de Dear (de Dear et al. 1997) and Quintela (Quintela et al. 2004). A mismatch of the values is up to 1 W.m-2.K-1, while an extreme was found on the manikin’s seat with a difference of over 1 W.m-2.K-1. The outcomes of this study provide essential information on how to create detailed computational models of thermal environment with regards to thermal comfort where separate values of convective and radiative heat transfer coefficients are required.

Klíčová slova

Thermal manikin, Heat transfer coefficients, Experimental work, Thermal comfort, Confidence intervals

Autoři

FOJTLÍN, M.; FIŠER, J.; JÍCHA, M.

Vydáno

19. 4. 2016

Nakladatel

Elsevier Inc.

ISSN

0894-1777

Periodikum

EXPERIMENTAL THERMAL AND FLUID SCIENCE

Ročník

77

Číslo

2016

Stát

Spojené státy americké

Strany od

257

Strany do

264

Strany počet

8

URL

http://www.journals.elsevier.com/experimental-thermal-and-fluid-science

BibTex

@article{BUT124104,
  author="Miloš {Fojtlín} and Jan {Fišer} and Miroslav {Jícha}",
  title="Determination of convective and radiative heat transfer coefficients using 34-zones thermal manikin: Uncertainty and reproducibility evaluation",
  journal="EXPERIMENTAL THERMAL AND FLUID SCIENCE",
  year="2016",
  volume="77",
  number="2016",
  pages="257--264",
  doi="10.1016/j.expthermflusci.2016.04.015",
  issn="0894-1777",
  url="http://www.journals.elsevier.com/experimental-thermal-and-fluid-science"
}